I’m in the same boat. I migrated my zigbee network from HUSBZB-1 to SkyConnect. I’m keeping HUSBZB-1 for my z-wave network and I am having conflicts due to having two zigbee coordinators with the same IEEE. I found where Nabu Casa has a tool to change the SkyConnect IEEE here, https://github.com/NabuCasa/universal-silabs-flasher, but I don’t know what to use as the IEEE address, whether there is an OUI that should be used, … Any insight anyone has would be appreciated.
I just got my Sky connect and followed these instructions thank you!
THANK YOU!
I can’t believe how easy that was.
Thank you for that link I will give it a try. I was just going to change it by one digit and hope for the best.
Just used this Instruction to switch from Conbee to SkyConnect, worked just fine! 
Sad trombone:
Error: IEEE address has already been written, it cannot be written again
I am going to try the same thing on the Nortek one.